The first rule of investing is this;
- Do not invest in what you don't know.
And that's why everything we invest in that we don't know leads to actual losses from just being potential losses. Those who have seen how Bitcoin works and understand it the way it is are the ones who decided to hold it for the long term. But it doesn't mean that the short-term folks don't understand it, they just chose the shorter path and they might be back for long-term holding too once they have profited from it. So, going back to the first rule, an ignorant investor is bound to losses.
I agree with what you said, we shouldn't invest in what we don't know anything about, DYOR and know whether it'll be profitable or not. In Bitcoin investment you can know about it but the knowledge is not enough for you to invest in it, you need to have a steady source of income. People who are struggling to make ends meet, the unemployed should forgo the thoughts of holding Bitcoin, they should try and increase their income before accumulating it. You need to hold Bitcoin for a long term before you can get ROI, except you buy during bull run, the longer you hodl the more profit it accrues to you on the long term.